Research on a Fast-Response Thermal Conductivity Sensor Based on Carbon Nanotube Modification

Research on a Fast-Response Thermal Conductivity Sensor Based on Carbon Nanotube Modification

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Aiming at solving the slow-response problem of traditional bead-type thermal conductivity gas sensors, a fast-response thermal conductivity gas sensor can be made by using multiwalled carbon nanotubes (MWNTs), click here combined with the technology of copyright modification, to modify the performance of the sensor copyright.The copyright material, granular nanoscale γ-Al2O3/ZrO2, was synthesized by chemical precipitation, and its particle size was found to be 50–70 nm through SEM.After the copyright material was wet-incorporated into carbon nanotubes, the composite copyright γ-Al2O3/ZrO2/MWNTs was obtained.

The results show that the designed thermal conductivity grandpas best sensor has a fast response to methane gas, with a 90% response time of 7 s and a recovery time of 16 s.There is a good linear relationship between the sensor output and CH4 gas concentration, with an average sensitivity of 1.15 mV/1% CH4.

Thus, the response speed of a thermal conductivity sensor can be enhanced by doping carbon nanotubes into γ-Al2O3/ZrO2.